I financed a 2007 g35 sedan in January for around $37000 OTD. After my 60mo term is up, I will have payed around $41000 (which 1. includes the interest on my loan and 2. assumes that I don't pay off the entire amount earlier to save on said interest).

Leasing was out of the question because I drive 20,000 miles a year. I think the over-mileage penalty would have killed me.

In order to get my money's worth, I know the best thing is to drive the car into the ground, but say after five years when your loan has just been entirely paid off you REALLY wanted a new car (i.e. THIRD generation G), how financially sound (or unsound) is it to sell/trade-in your car right away to get a new one?? Perhaps I should just sell/trade-in the car a few months before the new model is out to get a higher resale value??

I know I'm thinking way in advance here. I've only had my car for few months, but I already feel sick knowing that the VQ37VHR motor will soon make its way into the sedan (making my car a bit dated), so I know I'll be wanting the Third generation once it comes out.

 

Seems to me you've answered your own question. buying any brand new car is never "sound" from purely financial POV, not only you going to pay other set of interest also the sales tax, higher depreciation/insurance rate... If you have to have a "new" car? better alternative would be buying 1~2 years old car, of course we all know that, but how many of us are actually doing what is the best for ourselfs from financial POV whenever we makes a purcahse?